Mean-Green MG7127-D Premium Alternator: Jeep Cj/ Yj/ Tj/ Jk/ Wrangler/ Scrambler The Mean Green Alternator provides up to 300% more power than stock & can charge any engine no matter what it's power requirements. Superior Design with Easy 5 Minute Installation Up to 300% More Charging Power & 300,000 Mile Life Expectancy 1 Year Unconditional Guarantee Precision Balanced for Smooth Operation